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5. The focal length of a concave mirror is 30 cm. If the object is at 20 cm. Determine the position andnature of object. |
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Answer» For concave mirror u= -20 cm f= -30 cm By using mirror formula, 1/v + 1/u = 1/f 1/v + 1/-20 = 1/-30 v= 60 cm Positive sign indicates that image is in opposite side of mirror Therefore, The distance between image and object = 60+20 = 80 cm |
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